Yes!
Carolina biologic is a company that has many such slides. They even have
teaching series slides for specific classes (zoology, cellular biology,
botany, and many other such subjects including the medical field). That
is, you can buy slide series on a sertain subject, and buy individuals as
well. They are usually good slides. Another good place to look for cheap
slides is any nursing or pre-med type college where they have the students
prepare slides for classes. Good Luck!